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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df24cde9dc042e7f5ee55c75b104073e9f292c3b0178489c7be0581ec900c7f' 
  AND token = 'HzYT5ASYipfNtWdy/Icawj+YrhkU6HxnpYa/JucBfpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}